Answer: 0.24 moles
Explanation: Using IDEAL GAS LAW
PV=nRT
where,
P = pressure of the gas= 2.0 atm
V = volume of the gas= 3.00L
T =Temperature of gas=25^0C=(25+273)K=298K
n = number of moles of gas=?
R = Gas constant = 0.0821 Latm/moleK
n=\frac {PV}{RT}=\frac {2.0\times 3.0}{0.0821\times 298}=0.24moles
An ether is a compound that has two functional groups separated by an oxygen. The typical structure appears like this: R - O - R', where R and R' are the functional groups. R and R' can only be alkyl and aryl groups. Take for example the simplest ether, Dimethyl ether. The formula is given as CH3OCH3, where there are two methyl groups on each side of the ether. Notice that CH3 is a methyl group, which is an alkyl group.
The answer is B, oxygen. Oxygen and hydrogen compose a water molecule, and since water molecules have a bent molecular geometry and oxygen is significantly more electronegative, the molecule is also polar. Oxygen attracts the shared electron, creating a negative pole, and the hydrogen areas of the molecule form a positive pole.
Answer:
The experimental feature of the MALDI-MS technique which allows the separation of ions formed after the adduction of tissue molecules:
B) Velocity of ions depends on the ion mass-to-charge ratio.
Explanation:
- The option a is not correct as distance traveled by ions doesn't depend upon the ion charge rather it depends upon time for which you leave the sample to run.
- The option b is correct as velocity of ions depends on the ion mass-to-charge ratio because separation is done due to mass to charge ratio feature.
- The option c is incorrect as time of travel is not inversely proportional to the ion-to-mass ratio because the ion will move across the gel until you stop the electric field.
- The option d is not correct as electric field between MALDI plate and MS analyzer is though uniform but this feature doesn't allow the separation of ions.